In BF, too many players or too many tickets ruins some maps. If you've ever seen the state of Zavod on a 3000 ticket 64 player server after every destructible item has been destroyed, every tree felled, and every part of the battlefield covered in shell craters, it's a complete mess and practically unplayable due to the lack of cover and inability to move a vehicle other than a heli.
And usually you have someone camping in the MAA just outside base making movement in a heli infeasible
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They should just turn off building destruction in BF4 it adds nothing to most games I've played and often seems to result in lag, server instability and weird stuff like getting stuck in the debris and/or people camping in the debris that aren't being rendered properly or can't be shot at but can shoot out, etc. being able to blow holes through walls is cool but the whole buildings coming down seems poorly implemented.
EDIT: Same with siege of Shanghai really - screw the levolution crap if they'd made the C tower actually have something of an interior with the ability to blow holes in certain walls and floors/ceilings it would do far more for gameplay than the whole building coming down in some poor scripted sequence that probably took up more dev time.
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